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RE: Cantilever Diaphragm

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In the city of Los Angeles, you are only allowed to cantilever 15% of the main diaphragm span with a 4:1 aspect ratio.
For a 10' cantilever you need 67' of main diaphragm span and a width of 40'.
download Information Bulletin P/BC 2002-003 at www.ladbs.org
 
Also, be aware that R=3.5 for OMF with lots of limitations on using them.